Clicking the mouse is being read as a key?

This is kinda hard to explain.... well not really. I have a script that accesses UserInputService, and whenever either Z or Enter is pressed, it would run a specific function. But for some reason, whenever I click my mouse button, it's being read as Enter or Z, and it's running the function.

uis.InputBegan:Connect(function(input, gameprocessedevent)

if input.KeyCode == Enum.KeyCode.Z or Enum.KeyCode.KeypadEnter then

introscript.Disabled = true

introscript.Disabled = false

textscript.Disabled = true

text:Remove()

for i = images.ImageTransparency, 1, 0.1 do

images.ImageTransparency = i

wait()

end

for i = intro.Volume, 0, -0.1 do

intro.Volume = i

wait()

end

wait(.5)

introremote2:FireServer()

script.Disabled = true

end

end)